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There is No Third Body in the Eclipsing Binary System HS Herculis
We present a complete period analysis of eclipsing binary system HSHerculis. In order to increase the number of minimum times, we observedfive new minima in 2002 and 2003. Using all available minimum times, weanalyzed the O-C diagram of HS Her and we confirmed an apsidal motionwith a period of about 77 years. According to the results of thedetailed analysis, we determined that there is no third body in thesystem and the O-C curve can be explained with only apsidal motion.
| Times of Minima of Eclipsing Binaries DI Herculis and V1143 Cygni
Not Available
| The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars
The Henry Draper Extension Charts (HDEC), published in the form offinding charts, provide spectral classification for some 87000 starsmostly between 10th and 11th magnitude. This data, being highlyvaluable, as yet was practically unusable for modern computer-basedastronomy. An earlier pilot project (Roeser et al. 1991) demonstrated apossibility to convert this into a star catalogue, using measurements ofcartesian coordinates of stars on the charts and positions of theAstrographic Catalogue (AC) for subsequent identification. We presenthere a final HDEC catalogue comprising accurate positions, propermotions, magnitudes and spectral classes for 86933 stars of the HenryDraper Extension Charts.
| Possible Low Amplitude Light Variations of DI Her
Not Available
| A New Apsidal Motion Determination for DI Herculis
Not Available
| WBVR Photometry of DI Herculis
Not Available
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